Napkin holder



FIG. 1 is a perspective view of a napkin box showing our new ornamental design;

FIG. 2 is a top plan view of a napkin box showing our new ornamental design;

FIG. 3 is a bottom view of a napkin box showing our new ornamental design;

FIG. 4 is a front elevation view of a napkin box showing our new ornamental design;

FIG. 5 is a back elevation view of a napkin box showing our new ornamental design;

FIG. 6 is a right side elevation view of a napkin box showing our new ornamental design; and,

FIG. 7 is a left side elevation view of a napkin box showing our new ornamental design.

The broken lines in the Figures from no part of the claimed design. 

CLAIM The ornamental design for a napkin holder, as shown and described. 